SM5907AF datasheet(25/30 Pages) NPC

25 / 30 page

NIPPON PRECISION CIRCUITS-25

SM5907AF

Through-mode operation

If MSON is set LOW (80H command), an operating

mode that does not perform shock-proof functions

becomes active. In this case, input data is passed

as-is (except Force mute operation) to the output.

External DRAM is not accessed.

- In this case, input data needs to be at a rate fs

and the input word clock must be synchronized to

the CLK input (384fs). However, short-range jitter

can be tolerated (jitter-free system).

- Jitter-free system timing starts from the first

YLRCK rising edge after either (A) a reset (NRE-

SET= 0) release by taking the reset input from

LOW to HIGH or (B) by taking MSON from HIGH to

LOW. Accordingly, to provide for the largest possi-

ble jitter margin, it is necessary that the YLRCK

clock be at rate fs by the time jitter-free timing

starts.

The jitter margin is 0.2/ fs (80 clock cycles).

This jitter margin is the allowable difference

between the system clock (CLK) divided by 384 (fs

rate clock) and the YLRCK input clock.

If the timing difference exceeds the jitter margin,

irregular operation like data being output twice or,

conversely, incomplete data output may occur. In

the worst case, a click noise may also be generat-

ed.

When switching from shock-proof mode to through

mode, an output noise may be generated, and it is

therefore recommended to use the YDMUTE set-

ting to mute ZSRDATA until just before data output.

Force mute

Serial output data is muted by setting the YDMUTE

pin input HIGH or by setting the MUTE flag to 1.

Mute starts and finishes on the leading left-channel

bit.

When MSON is HIGH and valid data is empty

(MSEMP=H), the output is automatically forced into

the mute state.

12-bit comparison connection

When the CMP12 flag is set to 1, the least signifi-

cant 4 bits of the 16-bit comparison connection

input data are discarded and comparison connec-

tion is performed using the remaining 12 bits.

Note that if the CMP12 flag is set to 1 during a com-

parison connection operation, only the most signifi-

cant 12 bits are used for comparison connection

from that point on.

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